Uncertainty analysis of inelastic response of high-rise buildings to wind using a reduced-order building model
Uncertainty analysis of inelastic response of high-rise buildings to wind using a reduced-order building model
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DOI：
10.1016/j.engstruct.2023.116224
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发表时间：
2023-08
影响因子：
5.5
通讯作者：
Jinghui Huang;Xinzhong Chen
中科院分区：
文献类型：
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作者：
Jinghui Huang;Xinzhong Chen
以一栋60层钢结构建筑为例，通过对建筑结构降阶模型的响应时程仿真，量化了各种不确定性对建筑结构风振非弹性响应的影响。通过对一个高保真非线性分布塑性有限元建筑模型的模态push-over分析，建立了建筑结构的降阶模型及其不确定性。基本不确定性参数包括模态质量、刚度、阻尼比、屈服位移和载荷功率谱。结果表明，弹性响应的模态阻尼比的不确定性是导致响应标准差不确定性的主要原因，而非弹性响应的屈服位移的不确定性则是导致响应标准差不确定性的主要原因。高屈服水平下的非弹性响应的不确定性小于弹性响应的不确定性。极值响应的不确定性由随机性、抽样不确定性和参数不确定性的影响来确定。结果表明，考虑非高斯响应特性的交叉率理论可以较准确地估计随机性的影响。抽样和参数不确定性对极值响应的影响随着屈服水平的增加而减小。时变平均顺风向位移的不确定性也被量化，这是非常敏感的建筑物屈服位移。
The influence of various uncertainties on wind-induced inelastic building response is quantified through response time history simulation of a reduced-order building model of a 60-story steel building as an example. The reduced-order building model and its uncertainties are established through modal push-over analysis of a high-fidelity nonlinear finite element building model with distributed plasticity. The basic uncertain parameters are modal mass, stiffness, damping ratio and yielding displacement as well as loading power spectra. The results demonstrated that the uncertainty of response standard deviation (STD) is mainly contributed by uncertainty of modal damping ratio for elastic response, while it is further contributed by the uncertainty of the yielding displacement for inelastic response. The uncertainty of inelastic response with a higher level of yielding is less than that of elastic response. The uncertainty in extreme response is also determined in terms of the influences of randomness, sampling uncertainty and parameter uncertainty. The results showed that the influence of randomness can be accurately estimated using the crossing rate theory with consideration of non-Gaussian response character. The influence of sampling and parameter uncertainties on extreme response reduces with increasing level of yielding. The uncertainty in the time-varying mean alongwind displacement is also quantified, which is very sensitive to building yielding displacement.